James kuhn



J. KUHN.

v Face Tester for Millstones. No. 81,912. v Patented Sept. 8, 1868.

NnPETERS. FHOTO-LITHOGRAPHER. WASHINGTON, D c.

JAMES KUHN, OF MOUNT PLEASANT, PENNSYLVANIA.

Letters Patent No. 81,912, dated September 8, 1868.

IMPROVED PAGE-TESTER FOR MILESTONES.

"filly: Stigma: trferrzh in in these Enters @Eiltltl m lusting part at tlge same.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, JAMES KUHN, of Mount Pleasant, in the county of Westmorelnnd, and State of Pennsylvania, have invented a new and useful Improvement in Face-Testers for Millstones; and I do hereby declare that the following is a full,clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being bad to the accompanying drawings, forming part'of this specification, in which- Figure 1 is a vertical section of my invention.

Figure 2, a face view of the same.

Similar letters of reference indicate like parts.

This invention relates to a new and usefulsubstitute for the stafi'," which is now used for marking the faces of millstones, in order that they may be out down and brought into a plane when rendered uneven by wear.

The invention consists of a circular disk, of wood or other material, of the same diameter as the stone, and having a series of concentric annular projections made on its face side, whereby the stone, when the lisk'is fitted to it, will have all the prominent or raised surfaces marked by the color with which the projections are smeared, so that such prominences or raised surfaces may be out down;

- In the accompanying sheet of drawings, A represents a circular block, of wood or other suitable material, which is of the same diameter as the stone to be faced. This block has a hole at its centre, so that itmay be fitted on the spindle, which passes through thecentre of the bed-stone, that is, when the latter is to be faced, or fitted on any journal in the eye of the runner, when the latter is to be dressed or faced.

The face side of the block A is formed with a series of concentric annular projections, a, (see fig. 2,) and these projections are smeared with any suitable coloring-matter when the block is to be applied to a stone.

By this means it will be seen that when the block is applied to thelface of the stone, the projections a will come in contact with and color all the prominenoes on the face of the stone, and cannot come in contact with the depressions, as is the case when a staff is fitted on the spindle and turned around over the face of the stone.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent The circular block A, of wood or other suitable material, provided with concentric nnnularprojections, a, on its face side, substantially as and for the purpose set forth.

JAMES KUHN.

Witnesses:

J. LLOYD SHALLENBERGEB, J. U. CLARK. 

